中文摘要：

对已提出的基于浅埋松散围岩的拟塌落拱离散化有限元稳定性分析方法做了进一步研究。与其它数值仿真分析方法进行了对比，提出了该方法的明确定义及适用范围；通过与常规有限元方法计算结果的对比，进一步证明了该方法计算结果的合理性，能够更真实的反映浅埋松散围岩在近地表、滑裂面与地表相交部位、洞室项部以及拱脚、边墙底部等部位的围岩受拉情况及松散破碎围岩内部的屈服破坏以及岩体向洞内塌落的趋势，从而真实揭露出围岩发生拉裂、压坏并掉块的现象；以洞顶位移是否收敛为判断依据，初步探讨了离散界面参数以及离散块体大小对计算结果的影响，证明了塌落拱离散化有限元法在技术及工程上应用的可行性。

英文摘要：

Further researches on discretization finite element simulation of collapsing arch based on loose surrounding rock in shallow-buffed tunnels are performed. First of all, they are compared with other numerical simulation methods and the definition and the applicable scope are put forward. Compared with the results of the common finite element methods, it is further proved that the proposed method is reasonable and can more realistically reflect the tensile state of the surrounding rock in the near-surface, the intersecting site of slip surface with surface, the arch crown, the arch and the sidewall bottom, the yield damage of loose rock and the collapse trend of rock mass tunnel, so as to reveal the tensile breaking, fracturing and sloughing of rock, By regarding whether or not the displacement of the arch crown is convergent as the judgement basis, the influences of discrete interface parameters and block sizes on the results are preliminarily discussed, showing that the discrete DFEM is feasible in technical and project application.